/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.flink.api.table.expressions

import org.apache.flink.api.table.ExpressionException
import org.apache.flink.api.common.typeinfo.TypeInformation

case class UnresolvedFieldReference(override val name: String) extends LeafExpression {
  def typeInfo = throw new ExpressionException(s"Unresolved field reference: $this")

  override def toString = "\"" + name
}

case class ResolvedFieldReference(
    override val name: String,
    tpe: TypeInformation[_]) extends LeafExpression {
  def typeInfo = tpe

  override def toString = s"'$name"
}

case class Naming(child: Expression, override val name: String) extends UnaryExpression {
  def typeInfo = child.typeInfo

  override def toString = s"$child as '$name"
}
